<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>浮动案例</title>
    <style>
        div{
            width: 500px;
            height: 500px;
            float: left;
        }
        .box1{
            background-color: azure;
            
        }
        .box2{
            background-color: pink;
           
        }
        .box3{
            background-color: greenyellow;
            
        }
        .box4{
            width: 700px;
            height: 700px;
            clear: both;
            background-color: burlywood;
            }
    </style>
</head>
<body>
    <div class="box1"></div>
    <div class="box2"></div>
    <div class="box3"></div>
    <div class="box4"></div>
</body>
</html>